Synopsis

When Detective Bell falls victim to a biological attack at the precinct, Holmes and Watson hasten to his aid, only to find the station swiftly quarantined. As the lockdown tightens, Captain Gregson and Detective Bell begin to harbor a chilling suspicion: they may be confined within the building with the very person responsible. Meanwhile, Watson confronts a more personal crisis, navigating the painful reality of her mother Mary's declining health and the increasing need for medical care as Alzhe